It will get better, but in the mean time you just manually tell the AI to try again or adjust your prompt. I don't get the negativity about it not being perfect right off the bat. When the magic wand tool originally came out, it had tons of jagged edges. That didn't make it useless, it just meant it did a good chunk of the work for you and you just needed to manually get it the rest of the way there. With stable diffusion if I get a bad hand you just inpaint and regenerate it again until it's fixed. If you don't get the composition you want, just generate parts of the scene, combine it in an image editor, then have it use it as a base image to generate on top of.

They're showing you the raw output to show off the capabilities of the base model. In practice you would review the output and manually fix anything that's broken. Sure you'll get people too lazy to even do that, but non lazy people will be able to do really impressive things with this even in its current state.